littel question :)

[sharkwhite]

how valuable marketing emails of its users and fans
singer
garth brooks

just out of curiosity

[vincevalentine56]

Depends what you send them. If its a singer I would say send them music related emails.

[sharkwhite]

or mean the sale of email addresses
I did not send him advertising :)

how valuable email addresses of fans of famous people who buy their products and who follow them

for those who sell email addresses
and that the market price
to ask

or the end
They are sold at normal market price

there are niches with high added value compared to other
for example, the rich people who can spend a lot of money
and as those who enrolled in a major golf clubs etc.